Development of a universal synthetic strategy for two-dimensional (2D) Earth-abundant transition metal oxides nanomaterials is highly vital toward numerous electrochemical applications. Herein, a facile and general synthesis of highly ordered two-dimensional metal oxides nanomaterials includes CoO, NiO, CuO, and FeO nanosheets as an electrocatalyst for oxygen evolution reaction (OER) is demonstrated. Among the synthesized 2D transition metal oxides, the CoO nanosheet exhibits smallest overpotential (η) of ∼384.0 mV at a current density of 10.0 mA cm and Tafel slope of ∼52.0 mV dec, highest mass activity of ∼112.3 A g at the overpotential of ∼384.0 mV, and high turn over frequency (TOF) of 0.099 s, which is relatively favorable with state-of-the-art RuO catalyst. The present synthetic approach may unlock a brand new pathway to prepare shape-controlled Earth-abundant transition metal oxides nanomaterials for electrocatalytic OER.
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